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Articles in PresS, published online ahead of print April 10, 2002
Am J Physiol Gastrointest Liver Physiol, 10.1152/ajpgi.00462.2001
Submitted on October 31, 2001
Accepted on April 4, 2002
1 Department of Medicine, McMaster University, Hamilton, ON, Canada
* To whom correspondence should be addressed. E-mail: afoxrob{at}mcmaster.ca.
There is a close relationship between inflammatory bowel disease (IBD) and various hepatobiliary disorders. The objective of this study was to determine whether hepatic leukocyte recruitment occurs in experimental colitis. We used the murine model of colitis induced by 2,4-dinitrobenezenesulfonic acid (DNBS). Male C57Bl/6 mice received an intrarectal injection of 4mg DNBS in 100µl 50% ethanol. Controls received 100µl 50% ethanol. The hepatic microcirculation was examined at 3 and 14 days post-DNBS by intravital video microscopy. Three days post-DNBS when mice had developed acute colitis, there was associated hepatic leukocyte recruitment. Within the post-sinusoidal venules there was a 4-fold increase in the flux of rolling leukocytes that was P-selectin, but not
4-integrin dependent. There was also an increase in stationary leukocytes within the sinusoids, although this was not associated with an increase in serum alanine transaminase. By 14 days post-DNBS when macroscopic evidence of colonic inflammation was resolved, rolling within the post-sinusoidal venules had returned to control levels. In this murine model of colitis, we describe a link between acute colonic inflammation and remote hepatic leukocyte recruitment that is P-selectin dependent. Active IBD may lead to remote hepatic inflammation.
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